/* ========== CSS Variables ========== */
:root {
    --primary: #00D4AA;
    --primary-dark: #00B894;
    --secondary: #6C5CE7;
    --accent: #FD79A8;
    --bg-dark: #0A0E17;
    --bg-card: #131A2B;
    --bg-card-hover: #1A2540;
    --text-primary: #FFFFFF;
    --text-secondary: #8892B0;
    --success: #00D4AA;
    --warning: #FDCB6E;
    --danger: #FF6B6B;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #00D4AA 0%, #00B894 100%);
    --gradient-3: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Reset ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg-dark); color: var(--text-primary); min-height: 100vh; overflow-x: hidden; }

/* ========== Background Animation ========== */
.background-animation { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; overflow: hidden; }
.pulse-circle { position: absolute; border-radius: 50%; background: radial-gradient(circle, rgba(0, 212, 170, 0.1) 0%, transparent 70%); animation: pulse 8s infinite; }
.pulse-circle:nth-child(1) { width: 800px; height: 800px; top: -200px; right: -200px; }
.pulse-circle:nth-child(2) { width: 600px; height: 600px; bottom: -150px; left: -150px; animation-delay: 4s; }
@keyframes pulse { 0%, 100% { transform: scale(1); opacity: 0.5; } 50% { transform: scale(1.2); opacity: 0.3; } }

/* ========== Navbar ========== */
.navbar { position: fixed; top: 0; left: 0; right: 0; height: 70px; background: rgba(19, 26, 43, 0.9); backdrop-filter: blur(20px); display: flex; align-items: center; justify-content: space-between; padding: 0 40px; z-index: 1000; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.nav-brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 28px; }
.brand-text { font-size: 22px; font-weight: 700; color: var(--text-primary); }
.brand-text .accent { color: var(--primary); }
.nav-links { display: flex; gap: 8px; }
.nav-link { padding: 10px 20px; border-radius: 12px; color: var(--text-secondary); text-decoration: none; font-weight: 500; transition: var(--transition); display: flex; align-items: center; gap: 8px; }
.nav-link:hover, .nav-link.active { background: rgba(0, 212, 170, 0.1); color: var(--primary); }

/* ========== Main Content ========== */
.main-content { margin-left: 0; padding: 100px 40px 40px; position: relative; z-index: 1; }
.section { display: none; animation: fadeIn 0.5s ease; }
.section.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.section-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 32px; }
.section-header h1 { font-size: 32px; font-weight: 800; background: var(--gradient-2); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 8px; }
.section-header p { color: var(--text-secondary); font-size: 16px; }

/* ========== Stats Grid ========== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; margin-bottom: 40px; }
.stat-card { background: var(--bg-card); border-radius: var(--radius); padding: 28px; display: flex; align-items: center; gap: 20px; border: 1px solid rgba(255, 255, 255, 0.05); transition: var(--transition); position: relative; overflow: hidden; }
.stat-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--gradient-2); }
.stat-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); background: var(--bg-card-hover); }
.stat-card.doctors::before { background: var(--gradient-3); }
.stat-card.appointments::before { background: var(--gradient-1); }
.stat-icon { font-size: 40px; width: 70px; height: 70px; display: flex; align-items: center; justify-content: center; background: rgba(0, 212, 170, 0.1); border-radius: 16px; }
.stat-info h3 { font-size: 36px; font-weight: 800; margin-bottom: 4px; }
.stat-info p { color: var(--text-secondary); font-size: 14px; }

/* ========== Quick Actions ========== */
.quick-actions { margin-top: 40px; }
.quick-actions h2 { font-size: 24px; margin-bottom: 20px; color: var(--text-primary); }
.action-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.action-card { background: var(--bg-card); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius); padding: 24px; font-size: 16px; font-weight: 600; color: var(--text-primary); cursor: pointer; transition: var(--transition); text-align: center; }
.action-card:hover { background: var(--bg-card-hover); transform: translateY(-3px); border-color: var(--primary); box-shadow: 0 0 30px rgba(0, 212, 170, 0.2); }

/* ========== Buttons ========== */
.btn { padding: 12px 24px; border-radius: 12px; font-weight: 600; font-size: 14px; cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; gap: 8px; border: none; }
.btn-primary { background: var(--gradient-2); color: var(--bg-dark); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0, 212, 170, 0.3); }
.btn-secondary { background: transparent; border: 1px solid rgba(255, 255, 255, 0.2); color: var(--text-primary); }
.btn-secondary:hover { background: rgba(255, 255, 255, 0.1); }

/* ========== Search & Filter ========== */
.search-box { margin-bottom: 20px; }
.search-box input { width: 100%; max-width: 400px; padding: 14px 20px; background: var(--bg-card); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 12px; color: var(--text-primary); font-size: 16px; transition: var(--transition); }
.search-box input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 20px rgba(0, 212, 170, 0.2); }
.filter-buttons { display: flex; gap: 8px; margin-bottom: 24px; }
.filter-btn { padding: 10px 20px; background: var(--bg-card); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 10px; color: var(--text-secondary); cursor: pointer; transition: var(--transition); font-size: 14px; }
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: var(--bg-dark); border-color: var(--primary); }

/* ========== Data Table ========== */
.data-table-container { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; border: 1px solid rgba(255, 255, 255, 0.05); }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 16px 20px; text-align: left; }
.data-table th { background: rgba(0, 0, 0, 0.3); color: var(--text-secondary); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 1px; }
.data-table tr { border-bottom: 1px solid rgba(255, 255, 255, 0.05); transition: var(--transition); }
.data-table tbody tr:hover { background: var(--bg-card-hover); }
.data-table td { font-size: 15px; }
.table-actions { display: flex; gap: 8px; }
.table-actions button { padding: 8px 12px; border-radius: 8px; border: none; cursor: pointer; transition: var(--transition); font-size: 12px; }
.btn-view { background: rgba(108, 92, 231, 0.2); color: var(--secondary); }
.btn-delete { background: rgba(255, 107, 107, 0.2); color: var(--danger); }
.btn-view:hover, .btn-delete:hover { transform: scale(1.05); }

/* ========== Doctor Cards ========== */
.doctor-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.doctor-card { background: var(--bg-card); border-radius: var(--radius); padding: 28px; border: 1px solid rgba(255, 255, 255, 0.05); transition: var(--transition); text-align: center; }
.doctor-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: var(--secondary); }
.doctor-avatar { width: 80px; height: 80px; border-radius: 50%; background: var(--gradient-3); display: flex; align-items: center; justify-content: center; font-size: 32px; margin: 0 auto 16px; }
.doctor-card h3 { font-size: 20px; margin-bottom: 8px; }
.doctor-card .specialization { color: var(--primary); font-weight: 600; font-size: 14px; margin-bottom: 16px; }
.doctor-card .doctor-id { color: var(--text-secondary); font-size: 13px; }

/* ========== Appointments List ========== */
.appointments-list { display: grid; gap: 16px; }
.appointment-card { background: var(--bg-card); border-radius: var(--radius); padding: 24px; display: flex; align-items: center; gap: 20px; border: 1px solid rgba(255, 255, 255, 0.05); transition: var(--transition); }
.appointment-card:hover { background: var(--bg-card-hover); transform: translateX(5px); }
.appointment-date { background: var(--gradient-2); color: var(--bg-dark); padding: 16px; border-radius: 12px; text-align: center; min-width: 70px; }
.appointment-date .day { font-size: 24px; font-weight: 800; }
.appointment-date .month { font-size: 12px; font-weight: 600; }
.appointment-info h4 { font-size: 16px; margin-bottom: 4px; }
.appointment-info p { color: var(--text-secondary); font-size: 14px; }
.appointment-status { margin-left: auto; padding: 8px 16px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.status-confirmed { background: rgba(0, 212, 170, 0.2); color: var(--success); }
.status-pending { background: rgba(253, 203, 110, 0.2); color: var(--warning); }

/* ========== Modal ========== */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.8); backdrop-filter: blur(10px); display: none; align-items: center; justify-content: center; z-index: 2000; }
.modal-overlay.active { display: flex; }
.modal { background: var(--bg-card); border-radius: var(--radius); padding: 32px; width: 90%; max-width: 480px; animation: modalIn 0.3s ease; }
@keyframes modalIn { from { opacity: 0; transform: scale(0.9); } to { opacity: 1; transform: scale(1); } }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; }
.modal-header h2 { font-size: 24px; }
.modal-close { background: none; border: none; color: var(--text-secondary); font-size: 24px; cursor: pointer; transition: var(--transition); }
.modal-close:hover { color: var(--danger); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; color: var(--text-secondary); font-size: 14px; font-weight: 500; }
.form-group input, .form-group select { width: 100%; padding: 14px 16px; background: var(--bg-dark); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 10px; color: var(--text-primary); font-size: 16px; transition: var(--transition); }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 20px rgba(0, 212, 170, 0.2); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.modal-actions { display: flex; gap: 12px; justify-content: flex-end; margin-top: 28px; }

/* ========== Toast ========== */
.toast-container { position: fixed; bottom: 30px; right: 30px; z-index: 3000; display: flex; flex-direction: column; gap: 12px; }
.toast { padding: 16px 24px; border-radius: 12px; background: var(--bg-card); border-left: 4px solid var(--primary); color: var(--text-primary); animation: slideIn 0.3s ease; box-shadow: var(--shadow); }
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }
@keyframes slideIn { from { opacity: 0; transform: translateX(100px); } to { opacity: 1; transform: translateX(0); } }

/* ========== Responsive ========== */
@media (max-width: 768px) {
    .navbar { padding: 0 20px; flex-direction: column; height: auto; padding: 16px; gap: 16px; }
    .nav-links { flex-wrap: wrap; justify-content: center; }
    .main-content { padding: 160px 20px 20px; }
    .section-header { flex-direction: column; gap: 16px; }
    .form-row { grid-template-columns: 1fr; }
}